# Tag Info

• 31.9k
Accepted

### Modeling an either-or-constraint

You can introduce an additional binary variable $y$ that takes value $1$ if and only if at least one node from $I$ is matched with another one from $J$: \begin{align*} x_{ij} &\le y \quad \forall ...
• 10.9k
Accepted

### Modelling not evenly distributed discrete levels of a decision variable

If you plot your power levels versus the integers 0 to 3, you will see that the function is neither convex nor concave. For that reason, I am fairly confident you will need to use binary variables.
• 31.9k
Accepted

• 315
1 vote

### What fraction of the search space has been searched for ILP?

I would expect the measure of Xpress (and SCIP) to work reasonably well for infeasible problems. They take into account at which levels nodes have been pruned during search and that directly relates ...
• 11

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